The California Public Utilities Commission directed PG&E on Wednesday to drop the pressure on pipelines located in the Central Valley, Santa Clara County and the Santa Cruz County coast. The order stemmed from its investigation into the Sept. 9 explosion in San Bruno that killed eight people and destroyed 38 homes.

PG&E said late Wednesday that it already has started lowering pressure on the lines below their maximum allowable operating pressures.

The company also acknowledged it had intentionally increased the pressure on a dozen pipelines temporarily, in some cases going above the limit “by a few pounds.”